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diff --git a/examples/full-screen/simple-demos/focus.py b/examples/full-screen/simple-demos/focus.py
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+++ b/examples/full-screen/simple-demos/focus.py
@@ -0,0 +1,98 @@
+#!/usr/bin/env python
+"""
+Demonstration of how to programmatically focus a certain widget.
+"""
+from prompt_toolkit.application import Application
+from prompt_toolkit.buffer import Buffer
+from prompt_toolkit.document import Document
+from prompt_toolkit.key_binding import KeyBindings
+from prompt_toolkit.layout.containers import HSplit, VSplit, Window
+from prompt_toolkit.layout.controls import BufferControl, FormattedTextControl
+from prompt_toolkit.layout.layout import Layout
+
+# 1. The layout
+top_text = (
+    "Focus example.\n"
+    "[q] Quit [a] Focus left top [b] Right top [c] Left bottom [d] Right bottom."
+)
+
+LIPSUM = """Lorem ipsum dolor sit amet, consectetur adipiscing elit.
+Maecenas quis interdum enim. Nam viverra, mauris et blandit malesuada, ante est
+bibendum mauris, ac dignissim dui tellus quis ligula. Aenean condimentum leo at
+dignissim placerat. In vel dictum ex, vulputate accumsan mi. Donec ut quam
+placerat massa tempor elementum. Sed tristique mauris ac suscipit euismod. Ut
+tempus vehicula augue non venenatis. Mauris aliquam velit turpis, nec congue
+risus aliquam sit amet. Pellentesque blandit scelerisque felis, faucibus
+consequat ante. Curabitur tempor tortor a imperdiet tincidunt. Nam sed justo
+sit amet odio bibendum congue. Quisque varius ligula nec ligula gravida, sed
+convallis augue faucibus. Nunc ornare pharetra bibendum. Praesent blandit ex
+quis sodales maximus. """
+
+
+left_top = Window(BufferControl(Buffer(document=Document(LIPSUM))))
+left_bottom = Window(BufferControl(Buffer(document=Document(LIPSUM))))
+right_top = Window(BufferControl(Buffer(document=Document(LIPSUM))))
+right_bottom = Window(BufferControl(Buffer(document=Document(LIPSUM))))
+
+
+body = HSplit(
+    [
+        Window(FormattedTextControl(top_text), height=2, style="reverse"),
+        Window(height=1, char="-"),  # Horizontal line in the middle.
+        VSplit([left_top, Window(width=1, char="|"), right_top]),
+        Window(height=1, char="-"),  # Horizontal line in the middle.
+        VSplit([left_bottom, Window(width=1, char="|"), right_bottom]),
+    ]
+)
+
+
+# 2. Key bindings
+kb = KeyBindings()
+
+
+@kb.add("q")
+def _(event):
+    "Quit application."
+    event.app.exit()
+
+
+@kb.add("a")
+def _(event):
+    event.app.layout.focus(left_top)
+
+
+@kb.add("b")
+def _(event):
+    event.app.layout.focus(right_top)
+
+
+@kb.add("c")
+def _(event):
+    event.app.layout.focus(left_bottom)
+
+
+@kb.add("d")
+def _(event):
+    event.app.layout.focus(right_bottom)
+
+
+@kb.add("tab")
+def _(event):
+    event.app.layout.focus_next()
+
+
+@kb.add("s-tab")
+def _(event):
+    event.app.layout.focus_previous()
+
+
+# 3. The `Application`
+application = Application(layout=Layout(body), key_bindings=kb, full_screen=True)
+
+
+def run():
+    application.run()
+
+
+if __name__ == "__main__":
+    run()